Positioning method and apparatus

Abstract

Embodiments of this application provide a positioning method and apparatus. The method may include setting an ambiguity adjustment parameter for a mobile device, where the ambiguity adjustment parameter is used to record an ambiguity change status used to determine a virtual station observation value for the mobile device. The method may also include adjusting an observation value of a first primary datum station based on a first ambiguity adjustment parameter of the mobile device in a first serving cell to generate a first virtual station observation value, where the first primary datum station is a primary datum station of the first serving cell, and the first virtual station observation value is used to position the mobile device in the first serving cell; and sending the first virtual station observation value to the mobile device.

1 . A positioning method, comprising:
 setting an ambiguity adjustment parameter for a mobile device, wherein the ambiguity adjustment parameter is used to record an ambiguity change status used to determine a virtual station observation value for the mobile device;   adjusting an observation value of a first primary datum station based on a first ambiguity adjustment parameter of the mobile device in a first serving cell, to generate a first virtual station observation value, wherein the first primary datum station is a primary datum station of the first serving cell, and the first virtual station observation value is used to position the mobile device in the first serving cell; and   sending the first virtual station observation value to the mobile device.   
     
     
         2 . The method according to  claim 1 , wherein before the adjusting the observation value of the first primary datum station based on the first ambiguity adjustment parameter of the mobile device in the first serving cell, to generate the first virtual station observation value, the method further comprises:
 determining that the first primary datum station that provides a positioning service for the mobile device is the first primary datum station, wherein the first primary datum station is the first primary datum station of a network accessed by the mobile device; and   determining that the first ambiguity adjustment parameter is an initial value.   
     
     
         3 . The method according to  claim 1 , wherein before the adjusting the observation value of the first primary datum station based on the first ambiguity adjustment parameter of the mobile device in the first serving cell, to generate the first virtual station observation value, the method further comprises:
 determining that a primary datum station that provides a positioning service for the mobile device switches from a second primary datum station to the first primary datum station;   obtaining an ambiguity difference between the first primary datum station and the second primary datum station; and updating the ambiguity adjustment parameter to the first ambiguity adjustment parameter based on the ambiguity difference, wherein the first ambiguity adjustment parameter is obtained by summing a second ambiguity adjustment parameter of the mobile device in a second serving cell and the ambiguity difference, and the second primary datum station is a primary datum station of the second serving cell.   
     
     
         4 . The method according to  claim 3 , wherein the determining that the primary datum station that provides the positioning service for the mobile device switches from the second primary datum station to the first primary datum station comprises:
 receiving first position information of the mobile device at a current moment sent by the mobile device and second position information of the mobile device at a first moment determined and sent by the mobile device, wherein the first moment is after the current moment; and   determining, based on the first position information and the second position information, that the primary datum station that provides the positioning service for the mobile device switches from the second primary datum station to the first primary datum station.   
     
     
         5 . The method according to  claim 3 , wherein the determining that the primary datum station that provides the positioning service for the mobile device switches from the second primary datum station to the first primary datum station comprises:
 receiving first position information of the mobile device at a current moment sent by the mobile device and speed information and direction information of the mobile device at the current moment sent by the mobile device;   determining second position information of the mobile device at a first moment based on the first position information, the speed information, and the direction information, wherein the first moment is after the current moment; and   determining, based on the first position information and the second position information, that the primary datum station that provides the positioning service for the mobile device switches from the second primary datum station to the first primary datum station.   
     
     
         6 . The method according to  claim 3 , wherein the obtaining the ambiguity difference between the first primary datum station and the second primary datum station comprises:
 obtaining the ambiguity difference through vector calculation based on an ambiguity parameter of a known baseline in a datum station network, wherein the datum station network is a Delaunay triangulation network comprising a plurality of datum stations on a two-dimensional plane, and the known baseline forms a shortest path from the first primary datum station to the second primary datum station in the datum station network.   
     
     
         7 . A positioning method, comprising:
 receiving a first virtual station observation value sent by a service center, wherein the first virtual station observation value is generated by adjusting an observation value of a first primary datum station based on a first ambiguity adjustment parameter of a mobile device in a first serving cell, and the first primary datum station is a primary datum station of the first serving cell; and   positioning the mobile device based on the first virtual station observation value.   
     
     
         8 . The method according to  claim 7 , wherein the first ambiguity adjustment parameter is obtained by summing a second ambiguity adjustment parameter of the mobile device in a second serving cell and an ambiguity difference between the first primary datum station and a second primary datum station, the second primary datum station is a primary datum station of the second serving cell, and before receiving the first virtual station observation value sent by the service center, the method further comprises:
 sending first information to the service center, wherein the first information is used by the service center to determine that a primary datum station that provides a positioning service for the mobile device switches from the first primary datum station to the second primary datum station.   
     
     
         9 . The method according to  claim 8 , wherein the first information comprises first position information and second position information, and before the sending first information to the service center, the method further comprises:
 obtaining the first position information of the mobile device at a current moment and speed information and direction information of the mobile device at the current moment; and   determining the second position information of the mobile device at a first moment based on the first position information, the speed information, and the direction information, wherein the first moment is after the current moment.   
     
     
         10 . The method according to  claim 8 , wherein the first information comprises first position information of the mobile device at a current moment and speed information and direction information of the mobile device at the current moment. 
     
     
         11 . The method according to  claim 8 , wherein the method further comprises:
 receiving a second virtual station observation value sent by the service center, wherein the second virtual station observation value is obtained by adjusting an observation value of the second primary datum station based on the second ambiguity adjustment parameter; and   when the mobile device moves from the second serving cell to the first serving cell, switching a virtual station observation value used to position the mobile device from the second virtual station observation value to the first virtual station observation value.   
     
     
         12 . A positioning apparatus, comprising:
 a receiving unit configured to receive a first virtual station observation value sent by a service center, wherein the first virtual station observation value is generated by adjusting an observation value of a first primary datum station based on a first ambiguity adjustment parameter of a mobile device in a first serving cell, and the first primary datum station is a primary datum station of the first serving cell; and   a processing unity configured to position the mobile device based on the first virtual station observation value.   
     
     
         13 . The apparatus according to  claim 12 , wherein the first ambiguity adjustment parameter is obtained by summing a second ambiguity adjustment parameter of the mobile device in a second serving cell and an ambiguity difference between the first primary datum station and a second primary datum station, the second primary datum station is a primary datum station of the second serving cell, and the apparatus further comprises:
 a sending unit configured to send first information to the service center, wherein the first information is used by the service center to determine that a primary datum station that provides a positioning service for the mobile device switches from the first primary datum station to the second primary datum station.   
     
     
         14 . The apparatus according to  claim 13 , wherein the first information comprises first position information and second position information, and the apparatus further comprises:
 an obtaining unit configured to obtain the first position information of the mobile device at a current moment and speed information and direction information of the mobile device at the current moment; and   a determining unit configured to determine the second position information of the mobile device at a first moment based on the first position information, the speed information, and the direction information, wherein the first moment is after the current moment.   
     
     
         15 . The apparatus according to  claim 13 , wherein the first information comprises first position information of the mobile device at a current moment and speed information and direction information of the mobile device at the current moment. 
     
     
         16 . The apparatus according to  claim 13 , wherein the positioning apparatus further comprises:
 the receiving unit further configured to: receive a second virtual station observation value sent by the service center, wherein the second virtual station observation value is obtained by adjusting an observation value of the second primary datum station based on the second ambiguity adjustment parameter; and   a switching unit configured to: when the mobile device moves from the second serving cell to the first serving cell, switch a virtual station observation value used to position the mobile device from the second virtual station observation value to the first virtual station observation value.